41.[误]Three days after, he died.
[正]After three days, he died.
[正]Three days later, he died.
42.[误]She hid herself after the tree.
[正]She hid herself behind the tree.
[析]after多用来表达某动作之后，所以有的语法书中称它为动态介词，如：I run after him. After finishing my homework, I went to see a film.而behind则多用于静态事物之后。
43.[误]There is a beautiful bird on the tree.
[正]There is a beautiful bird in the tree.
[析]树上长出的果实，树叶要用on,而其他外来的人、物体均要用in the tree。
44.[误]Shanghai is on the east of China.
[正]Shanghai is in the east of China.
[析]在表达地理位置时有3个介词：in,on,to。in表示在某范围之内；on表示与某地区接壤；to则表示不相接。如：Japan is to the east of China.
45.[误]I arrived at New York on July 2nd.
[正]I arrived in New York on July 2nd。
[析]at用来表达较小的地方，而in用来表达较大的地方。at常用于at the school gate, at home, at a bus stop, at the station, at the cinema, at a small village。
46.[误]He lived in No.3 Beijing Road.
[正]He lived at No.3 Beijing Road.
[析]在门牌号码前要用at,并要注意它的惯用法：at the end of the street, at the foot of the mountain, at the top of the page。
47.[误]There is a colour TV set at the corner of the hall .
[正]There is a colour TV set in the corner of the hall.
[析]在屋内的角落应用in，而墙的外角用at，如：There is a tree at the corner of the street.
48.[误]Do you know there is some good news on today's newspaper?
[正]Do you know there is some good news in today's newspaper?
49.[误]The school will begin on September 1st.
[正]School will begin on September 1st.
[析]这里的school应看作不可数名词泛指学校的课程，即开学之意。要注意，有些活动场所当表达正在从事该种活动时不要加冠词， 如：at table(吃饭)，When I came to Tom's home,they were at table.还有：at desk(学习)，at work(工 作)，at school(上学)，in hospital(住医院)at church作礼拜如加上定冠词则另有他意，如：at the school即在学校工作 或办事，in the hospital即在医院工作或去看望病人。
50.[误]I'll leave Beijing to Shanghai tomorrow.
[正]I'll leave Beijing for Shanghai.
[正]I'll leave for Shanghai.
[析]leave for是离开某地去某处的固定搭配，不可将for改为别的介词。这样的搭配还有：start for动身前往某处，set out for，sail for。